We had some up-armored D7s in Afghanistan back in '04-'05. The armor tended to reduce airflow to the engine, so you couldn't run too long before shutting down to let it cool. Plus the first ones didn't have AC for the operator either. Being in a giant armored box in 115 degree weather with no airflow is less than fun.No experience with the D9s though. I wonder how similar they are to the ones the Israelis have been using for years.